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81c7b6ec SM |
1 | /* |
2 | * Copyright (c) 1990, 1991 Regents of the University of California. | |
11569edc SM |
3 | * All rights reserved. |
4 | * | |
6cfe221b KB |
5 | * This code is derived from the Stanford/CMU enet packet filter, |
6 | * (net/enet.c) distributed as part of 4.3BSD, and code contributed | |
81c7b6ec | 7 | * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence |
d9f44bf8 | 8 | * Berkeley Laboratory. |
11569edc | 9 | * |
81c7b6ec | 10 | * %sccs.include.redist.c% |
6cfe221b | 11 | * |
635b572c | 12 | * @(#)bpf.h 7.4 (Berkeley) %G% |
d9f44bf8 SM |
13 | * |
14 | * @(#) $Header: bpf.h,v 1.24 91/10/27 21:22:32 mccanne Exp $ (LBL) | |
11569edc SM |
15 | */ |
16 | ||
17 | /* | |
18 | * Alignment macros. BPF_WORDALIGN rounds up to the next | |
19 | * even multiple of BPF_ALIGNMENT. | |
20 | */ | |
21 | #define BPF_ALIGNMENT sizeof(long) | |
22 | #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) | |
23 | ||
f8e186b1 SM |
24 | #define BPF_MAXINSNS 512 |
25 | #define BPF_MAXBUFSIZE 0x8000 | |
635b572c | 26 | #define BPF_MINBUFSIZE 32 |
f8e186b1 | 27 | |
11569edc SM |
28 | /* |
29 | * Structure for BIOCSETF. | |
30 | */ | |
31 | struct bpf_program { | |
32 | u_int bf_len; | |
33 | struct bpf_insn *bf_insns; | |
34 | }; | |
35 | ||
36 | /* | |
37 | * Struct returned by BIOCGSTATS. | |
38 | */ | |
39 | struct bpf_stat { | |
40 | u_int bs_recv; /* number of packets received */ | |
41 | u_int bs_drop; /* number of packets dropped */ | |
42 | }; | |
43 | ||
635b572c SM |
44 | /* |
45 | * Struct return by BIOCVERSION. This represents the version number of | |
46 | * the filter language described by the instruction encodings below. | |
47 | * bpf understands a program iff kernel_major == filter_major && | |
48 | * kernel_minor >= filter_minor, that is, if the value returned by the | |
49 | * running kernel has the same major number and a minor number equal | |
50 | * equal to or less than the filter being downloaded. Otherwise, the | |
51 | * results are undefined, meaning an error may be returned or packets | |
52 | * may be accepted haphazardly. | |
53 | * It has nothing to do with the source code version. | |
54 | */ | |
55 | struct bpf_version { | |
56 | u_short bv_major; | |
57 | u_short bv_minor; | |
58 | }; | |
59 | /* Current version number. */ | |
60 | #define BPF_MAJOR_VERSION 1 | |
61 | #define BPF_MINOR_VERSION 1 | |
62 | ||
11569edc SM |
63 | /* |
64 | * BPF ioctls | |
65 | * | |
66 | * The first set is for compatibility with Sun's pcc style | |
67 | * header files. If your using gcc, we assume that you | |
68 | * have run fixincludes so the latter set should work. | |
69 | */ | |
d9f44bf8 | 70 | #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) |
11569edc | 71 | #define BIOCGBLEN _IOR(B,102, u_int) |
d9f44bf8 | 72 | #define BIOCSBLEN _IOWR(B,102, u_int) |
11569edc SM |
73 | #define BIOCSETF _IOW(B,103, struct bpf_program) |
74 | #define BIOCFLUSH _IO(B,104) | |
75 | #define BIOCPROMISC _IO(B,105) | |
732c04ca | 76 | #define BIOCGDLT _IOR(B,106, u_int) |
11569edc SM |
77 | #define BIOCGETIF _IOR(B,107, struct ifreq) |
78 | #define BIOCSETIF _IOW(B,108, struct ifreq) | |
79 | #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) | |
80 | #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) | |
81 | #define BIOCGSTATS _IOR(B,111, struct bpf_stat) | |
82 | #define BIOCIMMEDIATE _IOW(B,112, u_int) | |
635b572c | 83 | #define BIOCVERSION _IOR(B,113, struct bpf_version) |
11569edc | 84 | #else |
11569edc | 85 | #define BIOCGBLEN _IOR('B',102, u_int) |
d9f44bf8 | 86 | #define BIOCSBLEN _IOWR('B',102, u_int) |
11569edc SM |
87 | #define BIOCSETF _IOW('B',103, struct bpf_program) |
88 | #define BIOCFLUSH _IO('B',104) | |
89 | #define BIOCPROMISC _IO('B',105) | |
732c04ca | 90 | #define BIOCGDLT _IOR('B',106, u_int) |
11569edc SM |
91 | #define BIOCGETIF _IOR('B',107, struct ifreq) |
92 | #define BIOCSETIF _IOW('B',108, struct ifreq) | |
93 | #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) | |
94 | #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) | |
95 | #define BIOCGSTATS _IOR('B',111, struct bpf_stat) | |
96 | #define BIOCIMMEDIATE _IOW('B',112, u_int) | |
635b572c | 97 | #define BIOCVERSION _IOR('B',113, struct bpf_version) |
11569edc SM |
98 | #endif |
99 | ||
11569edc SM |
100 | /* |
101 | * Structure prepended to each packet. | |
102 | */ | |
103 | struct bpf_hdr { | |
104 | struct timeval bh_tstamp; /* time stamp */ | |
105 | u_long bh_caplen; /* length of captured portion */ | |
106 | u_long bh_datalen; /* original length of packet */ | |
107 | u_short bh_hdrlen; /* length of bpf header (this struct | |
108 | plus alignment padding) */ | |
109 | }; | |
110 | /* | |
111 | * Because the structure above is not a multiple of 4 bytes, some compilers | |
112 | * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. | |
113 | * Only the kernel needs to know about it; applications use bh_hdrlen. | |
114 | */ | |
115 | #ifdef KERNEL | |
116 | #define SIZEOF_BPF_HDR 18 | |
117 | #endif | |
118 | ||
119 | /* | |
120 | * Data-link level type codes. | |
732c04ca | 121 | * Currently, only DLT_EN10MB and DLT_SLIP are supported. |
11569edc | 122 | */ |
d9f44bf8 | 123 | #define DLT_NULL 0 /* no link-layer encapsulation */ |
11569edc SM |
124 | #define DLT_EN10MB 1 /* Ethernet (10Mb) */ |
125 | #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ | |
126 | #define DLT_AX25 3 /* Amateur Radio AX.25 */ | |
127 | #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ | |
128 | #define DLT_CHAOS 5 /* Chaos */ | |
129 | #define DLT_IEEE802 6 /* IEEE 802 Networks */ | |
130 | #define DLT_ARCNET 7 /* ARCNET */ | |
131 | #define DLT_SLIP 8 /* Serial Line IP */ | |
132 | #define DLT_PPP 9 /* Point-to-point Protocol */ | |
133 | #define DLT_FDDI 10 /* FDDI */ | |
134 | ||
135 | /* | |
e6ce130c | 136 | * The instruction encondings. |
11569edc | 137 | */ |
635b572c | 138 | /* instruction classes */ |
e6ce130c SM |
139 | #define BPF_CLASS(code) ((code) & 0x07) |
140 | #define BPF_LD 0x00 | |
141 | #define BPF_LDX 0x01 | |
142 | #define BPF_ST 0x02 | |
143 | #define BPF_STX 0x03 | |
144 | #define BPF_ALU 0x04 | |
145 | #define BPF_JMP 0x05 | |
146 | #define BPF_RET 0x06 | |
147 | #define BPF_MISC 0x07 | |
148 | ||
149 | /* ld/ldx fields */ | |
150 | #define BPF_SIZE(code) ((code) & 0x18) | |
151 | #define BPF_W 0x00 | |
152 | #define BPF_H 0x08 | |
153 | #define BPF_B 0x10 | |
154 | #define BPF_MODE(code) ((code) & 0xe0) | |
155 | #define BPF_IMM 0x00 | |
156 | #define BPF_ABS 0x20 | |
157 | #define BPF_IND 0x40 | |
158 | #define BPF_MEM 0x60 | |
159 | #define BPF_LEN 0x80 | |
160 | #define BPF_MSH 0xa0 | |
161 | ||
162 | /* alu/jmp fields */ | |
163 | #define BPF_OP(code) ((code) & 0xf0) | |
164 | #define BPF_ADD 0x00 | |
165 | #define BPF_SUB 0x10 | |
166 | #define BPF_MUL 0x20 | |
167 | #define BPF_DIV 0x30 | |
168 | #define BPF_OR 0x40 | |
169 | #define BPF_AND 0x50 | |
170 | #define BPF_LSH 0x60 | |
171 | #define BPF_RSH 0x70 | |
172 | #define BPF_NEG 0x80 | |
173 | #define BPF_JA 0x00 | |
174 | #define BPF_JEQ 0x10 | |
175 | #define BPF_JGT 0x20 | |
176 | #define BPF_JGE 0x30 | |
177 | #define BPF_JSET 0x40 | |
178 | #define BPF_SRC(code) ((code) & 0x08) | |
179 | #define BPF_K 0x00 | |
180 | #define BPF_X 0x08 | |
181 | ||
182 | /* ret - BPF_K and BPF_X also apply */ | |
183 | #define BPF_RVAL(code) ((code) & 0x18) | |
184 | #define BPF_A 0x10 | |
11569edc | 185 | |
e6ce130c SM |
186 | /* misc */ |
187 | #define BPF_MISCOP(code) ((code) & 0xf8) | |
188 | #define BPF_TAX 0x00 | |
189 | #define BPF_TXA 0x80 | |
11569edc SM |
190 | |
191 | /* | |
192 | * The instruction data structure. | |
193 | */ | |
194 | struct bpf_insn { | |
195 | u_short code; | |
196 | u_char jt; | |
197 | u_char jf; | |
198 | long k; | |
199 | }; | |
200 | ||
201 | /* | |
e6ce130c | 202 | * Macros for insn array initializers. |
11569edc | 203 | */ |
e6ce130c SM |
204 | #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } |
205 | #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } | |
11569edc SM |
206 | |
207 | #ifdef KERNEL | |
208 | extern u_int bpf_filter(); | |
209 | extern void bpfattach(); | |
210 | extern void bpf_tap(); | |
211 | extern void bpf_mtap(); | |
212 | #endif | |
213 | ||
214 | /* | |
e6ce130c | 215 | * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). |
11569edc SM |
216 | */ |
217 | #define BPF_MEMWORDS 16 | |
d9f44bf8 | 218 |